{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-40222", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.180Z", "datePublished": "2025-12-04T15:31:14.142Z", "dateUpdated": "2026-05-11T21:45:09.287Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:45:09.287Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: serial: sh-sci: fix RSCI FIFO overrun handling\n\nThe receive error handling code is shared between RSCI and all other\nSCIF port types, but the RSCI overrun_reg is specified as a memory\noffset, while for other SCIF types it is an enum value used to index\ninto the sci_port_params->regs array, as mentioned above the\nsci_serial_in() function.\n\nFor RSCI, the overrun_reg is CSR (0x48), causing the sci_getreg() call\ninside the sci_handle_fifo_overrun() function to index outside the\nbounds of the regs array, which currently has a size of 20, as specified\nby SCI_NR_REGS.\n\nBecause of this, we end up accessing memory outside of RSCI's\nrsci_port_params structure, which, when interpreted as a plat_sci_reg,\nhappens to have a non-zero size, causing the following WARN when\nsci_serial_in() is called, as the accidental size does not match the\nsupported register sizes.\n\nThe existence of the overrun_reg needs to be checked because\nSCIx_SH3_SCIF_REGTYPE has overrun_reg set to SCLSR, but SCLSR is not\npresent in the regs array.\n\nAvoid calling sci_getreg() for port types which don't use standard\nregister handling.\n\nUse the ops->read_reg() and ops->write_reg() functions to properly read\nand write registers for RSCI, and change the type of the status variable\nto accommodate the 32-bit CSR register.\n\nsci_getreg() and sci_serial_in() are also called with overrun_reg in the\nsci_mpxed_interrupt() interrupt handler, but that code path is not used\nfor RSCI, as it does not have a muxed interrupt.\n\n------------[ cut here ]------------\nInvalid register access\nWARNING: CPU: 0 PID: 0 at drivers/tty/serial/sh-sci.c:522 sci_serial_in+0x38/0xac\nModules linked in: renesas_usbhs at24 rzt2h_adc industrialio_adc sha256 cfg80211 bluetooth ecdh_generic ecc rfkill fuse drm backlight ipv6\nCPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.17.0-rc1+ #30 PREEMPT\nHardware name: Renesas RZ/T2H EVK Board based on r9a09g077m44 (DT)\npstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\npc : sci_serial_in+0x38/0xac\nlr : sci_serial_in+0x38/0xac\nsp : ffff800080003e80\nx29: ffff800080003e80 x28: ffff800082195b80 x27: 000000000000000d\nx26: ffff8000821956d0 x25: 0000000000000000 x24: ffff800082195b80\nx23: ffff000180e0d800 x22: 0000000000000010 x21: 0000000000000000\nx20: 0000000000000010 x19: ffff000180e72000 x18: 000000000000000a\nx17: ffff8002bcee7000 x16: ffff800080000000 x15: 0720072007200720\nx14: 0720072007200720 x13: 0720072007200720 x12: 0720072007200720\nx11: 0000000000000058 x10: 0000000000000018 x9 : ffff8000821a6a48\nx8 : 0000000000057fa8 x7 : 0000000000000406 x6 : ffff8000821fea48\nx5 : ffff00033ef88408 x4 : ffff8002bcee7000 x3 : ffff800082195b80\nx2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff800082195b80\nCall trace:\n sci_serial_in+0x38/0xac (P)\n sci_handle_fifo_overrun.isra.0+0x70/0x134\n sci_er_interrupt+0x50/0x39c\n __handle_irq_event_percpu+0x48/0x140\n handle_irq_event+0x44/0xb0\n handle_fasteoi_irq+0xf4/0x1a0\n handle_irq_desc+0x34/0x58\n generic_handle_domain_irq+0x1c/0x28\n gic_handle_irq+0x4c/0x140\n call_on_irq_stack+0x30/0x48\n do_interrupt_handler+0x80/0x84\n el1_interrupt+0x34/0x68\n el1h_64_irq_handler+0x18/0x24\n el1h_64_irq+0x6c/0x70\n default_idle_call+0x28/0x58 (P)\n do_idle+0x1f8/0x250\n cpu_startup_entry+0x34/0x3c\n rest_init+0xd8/0xe0\n console_on_rootfs+0x0/0x6c\n __primary_switched+0x88/0x90\n---[ end trace 0000000000000000 ]---" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/tty/serial/sh-sci.c" ], "versions": [ { "version": "0666e3fe95ab55c295984f2f51277ec27d3f190c", "lessThan": "2ec9bbd09a6cdf5b8c726be34f29630faf585d07", "status": "affected", "versionType": "git" }, { "version": "0666e3fe95ab55c295984f2f51277ec27d3f190c", "lessThan": "ef8fef45c74b5a0059488fda2df65fa133f7d7d0", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/tty/serial/sh-sci.c" ], "versions": [ { "version": "6.17", "status": "affected" }, { "version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver" }, { "version": "6.17.6", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "6.17.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "6.18" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/2ec9bbd09a6cdf5b8c726be34f29630faf585d07" }, { "url": "https://git.kernel.org/stable/c/ef8fef45c74b5a0059488fda2df65fa133f7d7d0" } ], "title": "tty: serial: sh-sci: fix RSCI FIFO overrun handling", "x_generator": { "engine": "bippy-1.2.0" } } } }